Electronic key for a vehicle

Abstract

An electronic key, e.g., a wireless key for a vehicle, is disclosed. The key has a housing with a housing wall having a semi-transparent display section. An information symbol for representing information to be displayed to a user is further provided. The display section has a housing wall section with reduced wall thickness, wherein a light-impermeable layer, in which recesses representing the information symbol are produced, is applied to an inner side of the housing. The combination of a housing wall section of reduced thickness and the light-impermeable layer on the inner side of the housing as an information symbol provided in the display section creates an information symbol that may be very sharp and bright when backlit and, due to the semitransparent formation of the display section, is not visible when not backlit.

What is claimed is: 
     
       1. An electronic key for a vehicle, comprising:
 a housing having a housing wall that includes a semitransparent display section; 
 an information symbol that represents an item of information to be displayed to a user; 
 wherein the display section has a housing wall section with a reduced wall thickness; and 
 an opaque layer applied to an inner side of the housing wall section with the reduced wall thickness, said opaque layer including cutouts that at least partially define the information symbol. 
 
     
     
       2. The electronic key of  claim 1 , wherein the layer has a light-absorbing paint. 
     
     
       3. The electronic key of  claim 1 , further comprising a lighting source arranged on the inner side of the housing wall section with the reduced wall thickness, wherein the lighting source is configured to illuminate said housing inner side. 
     
     
       4. The electronic key of  claim 1 , further comprising:
 a switching element configured to initiate a key function, and 
 a switching cap in the housing and configured for actuation by a user, wherein the switching cap is mechanically connected to the switching element for actuation of the switching element via user actuation of the switching cap, 
 wherein the display section is provided in the switching cap. 
 
     
     
       5. The electronic key of  claim 1 , wherein the semitransparent display section is formed by a semitransparent material of the housing wall in a region of the display section. 
     
     
       6. The electronic key of  claim 5 , wherein the semitransparent material is a semitransparent plastic. 
     
     
       7. The electronic key of  claim 1 , comprising a semitransparent layer applied to an outer side of the housing wall in a region of the display section. 
     
     
       8. The electronic key of  claim 1 , wherein an outer side of the housing wall is homogeneous in a region of the display section. 
     
     
       9. A method for producing a housing for an electronic key for a vehicle, said method comprising:
 providing an injection mold having a molding space configured to form a housing having a housing wall section with a reduced wall thickness; 
 injecting a molding compound into the molding space; and 
 applying an opaque layer to the housing wall section with the reduced wall thickness, said opaque layer including cutouts that at least partially define an information symbol that represents an item of information to be displayed to a user, 
 wherein forming the housing wall section with the reduced wall thickness comprises moving a movable slide of the injection mold into the molding space once a molding compound has been injected into the molding space in a plastically deformable state of the molding compound. 
 
     
     
       10. The method as claimed in  claim 9 , comprising:
 applying the opaque layer continuously to the housing wall section with the reduced wall thickness on a side on which the slide has been pressed in, and 
 removing the opaque layer in a region of the housing wall section with the reduced wall thickness such that cutouts produced in the process represent the information symbol. 
 
     
     
       11. The method of  claim 10 , wherein the removal of the light-absorbing layer is performed by a laser or by a mechanical device. 
     
     
       12. The method of  claim 9 , wherein the application of the opaque layer with a cut-out information symbol is performed by a printing process. 
     
     
       13. The method of  claim 12 , wherein the printing process is a pad printing process. 
     
     
       14. The method of  claim 9 , wherein the application of the opaque layer with a cut-out information symbol is performed a photochemical process. 
     
     
       15. An electronic key for a vehicle, comprising:
 a housing having a housing wall that includes a semitransparent display section; 
 an information symbol that represents an item of information to be displayed to a user; 
 the display section having a housing wall section with a reduced wall thickness; 
 an opaque layer applied to an inner side of the housing wall section with the reduced wall thickness, said opaque layer including cutouts that at least partially define the information symbol; 
 a lighting source arranged on the inner side of the housing wall section with the reduced wall thickness, the lighting source configured to illuminate said housing inner side; 
 a switching element configured to initiate a key function; 
 a switching cap in the housing and configured for actuation by a user, wherein the switching cap is mechanically connected to the switching element for actuation of the switching element via user actuation of the switching cap.